Plow point



I Feb. 9, 194-3. w sk 2,310,336-

PLOW PO INT Filed Aug. 17,1939 2 Sheets-Sheet 1 fifth M Zwaaim M w m Feb. 9, 1943. M, ZWASKA 2,310,336

PLOW PO INT Filed Aug. 17, 1959 2 Sheets-Sheet 2 WWII/011111,,

I M 36 {ho f ammo tow Patented Feb. 9, 1943 UNITED STATES PATENTOFFICE PLOW POINT John M. Zwaska, Auburndale, Wis.

Application August 17, 1939, Serial No. 290,682

6 Claims.

This invention relates to an improved construction of plow and aims, particularly, to provide a plow having a removable point and blade capable of being readily removed for replacement or for sharpening.

"Due to the constantly decreasing number of blacksmith shops, it is becoming increasing difficult for farmers to have their worn plow points remade, tempered and sharpened by a blacksmith.

It is therefore a primary aim of this invention to provide an improved construction of plow wherein the point and blade are removable from the share so that the parts may be readily sharpened by the farmer and when worn out replaced with a new point and blade.

Still another object of the invention is to provide a plow having a removable shin plate capable of being replaced independently of the remaining elements of the plow.

Still a further object of the invention is to provide an improved construction of plow wherein the point and blade may be made integral or detachable and so constructed and shaped as to be readily fitted to a plowshare and securely and rigidly positioned relatively thereto.

It is a further aim of the invention to provide an improved attachment for plows which will fit all previously built plows and new plows without alteration. By means of such structure new sharpened points and blades may be provided to replace corresponding dull and worn out parts so that the new parts may be obtained at approximately the same cost as sharpening the old parts, and readily applied to a plow by the average farmer.

A particular advantage of the invention resides in the fact that the main body of the plow lay can be formed of heavy semi cast iron while the plow point and blade can be formed of steel, such as soft center steel, thus giving the advantage of steel cutting edges at a minimum cost and making it less expensive to replace the plow point and blade when they become worn to such an extent as to throw the plow out of balance and hamper its proper operation. This construction in addition to materially reducing the original cost of a plow also reduces the cost of replacements as the major portion of the plow, which seldom if ever requires replacement is formed of semi-cast iron so that the cost of replacing the steel point and blade is greatly reduced. I

A further advantage of the invention resides in the provision of the removable shin plate which covers that portion of the plow directly above and behind the point and which receives the most wear so that when the plate is worn thin it may be removed and replaced thus preventing a deep impression from being worn in that part of the plow which the shin plate covers, this saving replacement of the plow lay.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings, which illustrate a preferred embodiment thereof, and wherein:

Figure 1 is a bottom plan view showing the preferred form of the invention, comprising a plow point and detachable plow blade detachably assembled on a share,

Figure 2 is a fragmentary top plan view of the same,

Figure 3 is a perspective view of the plow blade,

Figure 4 is a transverse sectional view taken along the line 4-4 of Figure 1,

Figure 5 is a transverse vertical sectional view taken through the point substantially along the line 5-5 of Figure 4,

Figure 6 is a bottom plan view showing the plow point and blade formed integral,

Figure 7 is an end view in elevation of the same looking toward the landside portion of the point, and

Figure 8 is a transverse sectional View taken along the line 88 of Figure 6.

Referring more particularly to the drawings, wherein like reference characters designate like or corresponding parts throughout the difierent views, l0 designates generally a share adapted to be secured to the frog of a plow, not shown. Theshare Ill has a tapered leading edge H which is offset upwardly from the plane of the remainder of the share, as best seen in Figure 4. A pair of lugs I2 are secured to the underside of the share NJ, in spaced apart relationship to each other, and are provided with the outwardly ofiset free ends 13 which extend toward the edge I l, for a purpose which will hereinafter be described.

In the form of the invention as illustrated in Figures 1 to 5, the plow point, designated generall IA, and the plow blade l5 are formedseparate. The underside of the forward edge of the blade I5 is'beveled, as seen in Figure 3, to form the sharpened cutting edge It. The back edge of the blade I5 is provided with a pair of corresponding spaced notches I! for engagement with the lugs l2, as will hereinafter be explained.

Blade I5 is adapted to be positioned with its rear portion against the underside of the leading edge II of the share ID with the inner ends of the flange portions I3 of the lugs l2 fitting into the notches IT for alining the openings I8 in the blade I5 with corresponding openings in portion I I for receiving fastenings I9 for detachably connecting share I and blade I5.

Plow point I4 is provided with a recess 25 in its upper side and adjacent its rear end which terminates in a shoulder 2|, adjacent the forward end of the point I 4, which is disposed at an acute angle to the plane of the recess 2!], as seen in Figure 4, and which defines its forward end. The leading end 22 of the share I0 is tapered and cut-01f at an angle, as seen in dotted lines in Figure 2, to fit and rest flush on the back portion of the recess 20. Recess 20 adjacent its forward part is provided with a deepened portion 23 shaped to correspond to the leading end 24 of the blade I into which said portion 24 is snugly fitted, as seen in dotted lines in Figure 2. As seen in Figure 2, a part of the leading end 24 is disposed beneath the tapered leading end 22 of share If].

A detachable shin plate 25 is shaped to fit the recess 20 in overlapping relationship to portions 22 and 24 and is provided with the inclined forward end 25 which fits in the notch formed by the shoulder 2!. Shin plate 25 is provided with three spaced openings, one of which alines with a corresponding opening in portion 24 and in portion 2! formed by the recess 28 in the bottom of the point I4, to receive the fastening 29 which connects plow point I4, blade I5 and shin plate 25. Shin plate 25 is provided with an opening intermediate of its ends which registers with a corresponding opening in portion 22 and in the portion 30 formed by the recess 3| in the under back part of the point I4 to receive the fastening 32 which connects the intermediate portion of the shin plate 25 to the plow point I4 and to the share I0. Shin plate 25 is also provided with an Opening adjacent its rear end which alines with a corresponding opening in portion 22 adjacent the back edge of the share II] to receive the fastening 33 for connecting the back portion of these parts behind and above the rear edge of the point I4. As best seen in Figure 4, the upper edge of the forward end of the shin plate 25 is flush with the adjacent portion of the point I 4 and is shaped on its landside edge to form a continuation of the curvature of the top of the point I4.

The landside 34 of the plow point I4 is provided with a recess adjacent its rear end, as best seen at 35 in Figure 1, forming the portion 36 which is disposed adjacent to and substantially at right angles to the portion 30. A tongue 31, as seen in dotted lines in Figure 4, extends into the recess 35. A removable landside section 38 has a tapered forward end shaped to fit the recessed portion 35 and a groove 39 therein for engagement with the tongue 31. Said tapered end and the portion 36 are provided with alined openings to receive the fastening 45 for detachably securing the plow point E4 to the landside section 38.

From the foregoing it will be seen, that the share I 0 is detachably connected to the blade I5, point I4, shin plate 25 and landside section 38, and that each of these parts are likewise detachably connected to each other so that point I4 may be detached from the remaining parts for sharpening or replacing as may likewise be the blade I5 and shin plate 25. The landside section 38 and the share I0 are subject to very little wear so that these parts may be used almost indefinitely without replacement.

In Figures 6, '7 and 8 a slightly modified form of the invention is shown wherein the plow point I4 is formed integral with the blade I5. The shape of these parts is substantially identical with the shape of the plow point I4 and blade I5, as connected, so that these parts can be readily attached to the share I0, shin plate 25 and landside section 38 in the same manner as the point I4 and blade I5. The point I4 is provided with the opening 40 to receive a fastening corresponding to the fastening 29 for attaching the forward end of the shin plate, not shown, to the plow point I4 and is likewise provided with an opening 4| in its portion 30 to receive a fastening cor responding to the fastening 32 for securing the intermediate portion of the shin plate 25 to the rear portion of the point I4. An opening 42 in portion 35 is adapted to receive a fastening for securing a landside section 38, not shown, in the recessed portion 35' of the landside 34.

In view of the foregoing description of the form as shown in Figures 1 to 5, a further description of the manner in which the integral point and blade I4 and I5, respectively, may be attached to and removed from the share IO, shin plate 25 and landside section 38 is deemed unnecessary.

Various modifications and changes are contemplated and may be resorted to provided they fall within the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. A plow comprising a point having a recess to receive an end of a plow blade, said point having an angular member, formed integral therewith and adjacent the rear of said recess a share secured to one of the sides of said angular memher and having a tapered lower edge overlying said blade, fastening means for securing said blade to said share, said point having a recessed portion in its upper side and rearwardly of its forward end, a shin plate removably mounted in the recessed portion of said point and removably secured thereto, said shin plate partially overlying one end of said share for clamping it to said point, and said point including a landside provided with a detachable section.

2. In a plow, a share adapted to be secured to a plow frog, a plow point detachably secured to one end of said share, a blade carried by said plow point and having its back edge disposed beneath the forward edge of said share, means for detachably connecting said blade and share, and a shin plate detachably connected to the upper side of said point and overlying one end of said share, said point being recessed to receive said shin plate and having a notch forming a seat for the forward end thereof.

3. A device as in claim 2, comprising a detachable section provided with a groove in one end thereof, said plow point having a landside recessed at its rear end and provided with a tongue extending into said recess for engaging the groove of said section, said section being detachably secured in the recessed portion of said point to form a part of the landside.

4. A plow comprising a share, a point detachably connected to said share, and a blade detachably secured along its rear edge to the forward edge of said share and detachably connected at one end to said point, said blade having spaced recessed portions in its back edge, the forward edge of said share being tapered and offset upwardly for engaging and partially overlapping said blade, and lugs secured to the underside of said share and having ofiset forwardly projecting free ends for engaging said recessed portions.

5. In a plow,'a share, a plow point detachably secured to the leading end of said share, a blade formed integral with and projecting obliquely from the plow point, and means for detachably connecting the rear edge of said blade to the underside of the forward edge of said share, said means including lugs secured to the underside of the share and having downwardly oifset forwardly extending free ends for engaging beneath the blade, said plow point having its upper rear portion recessed to receive the leading end of the share, and a shin plate detachably secured to said point in overlying relationship to said leading end, the upper side of said shin plate being disposed substantially flush with the upper side of the forward end of the point.

6. In a plow, a share, a plow point detachably secured to one end of said share, a plow blade detachably connected to the leading edge of said share with its cutting edge projecting outwardly from beneath said leading edge, said point being recessed to receive one end of said blade, and a shin plate secured to the upper back portion of the plow point in overlapping relationship to corresponding ends of the share and blade.

JOHN M, ZVVASKA. 

